Enclosure for use in a fiber optic distribution network

ABSTRACT

The present disclosure relates to a re-enterable enclosure for a fiber optic network. The enclosure can include features such as a low compression-force perimeter gasket, cable seals constructed to seal effectively seal triple points, multi-function port size reducer plugs and multi-function blind plugs.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional of U.S. patent application Ser. No. 15/524,431, filed on May 4, 2017, which is a National Stage Application of PCT/EP2015/075694, filed on Nov. 4, 2015, which claims the benefit of U.S. Patent Application Ser. No. 62/074,967, filed on Nov. 4, 2014, the disclosures of which are incorporated herein by reference in their entireties. To the extent appropriate, a claim of priority is made to each of the above disclosed applications.

TECHNICAL FIELD

The present disclosure relates generally to enclosures. More particularly, the present disclosure relates to sealed, re-enterable enclosures used in fiber optic distribution networks.

BACKGROUND

Fiber optic distribution networks are becoming prevalent in part because service providers want to deliver high bandwidth communication capabilities to customers (i.e., subscribers). Fiber to the x (FTTX) refers to any broadband network architecture that uses optical fiber to provide all or part of the local loop used for last mile telecommunications. More specific broadband network architectures include fiber to the curb (FTTC), fiber to the distribution point (FTTdp), fiber to the premises (FTTP) and fiber to the desktop (FTTD). Typical fiber optic network architectures include a plurality of fiber optic cables distributed outwardly from a central location (e.g., a central office) toward subscriber locations.

In a typical fiber optic distribution network, sealed and re-enterable enclosures can be used to provide access to the optical fibers of the network distribution cables. Commonly, multi-fiber distribution cables are passed through the enclosures and optical fibers of the cables are accessed within the enclosures. Splice trays, passive optical splitters and wave length division multiplexers can be provided within the enclosures. In certain examples, optical fibers accessed from distribution cables can be coupled to optical components (e.g., a passive optical splitter or a wavelength division multiplexer) and outputs from the optical components can be coupled to drop cables routed from the enclosures. In certain examples, the enclosures can include ruggedized adapter ports for allowing pre-connectorized drop cables to be connected to the fibers accessed from the distribution cables. In other examples, fibers of the distribution cable can be spliced to optical fibers corresponding to drop cables routed out of the enclosure through sealed ports. Example enclosures of the type described above are disclosed at U.S. Pat. Nos. 8,213,760; 8,718,434; and 7,013,074.

SUMMARY

Effective sealing is an important consideration relating to sealed, re-enterable outdoor enclosures used in fiber optic distribution networks. Aspects of the present disclosure relate to enhanced sealing configurations for providing effective sealing of enclosures.

Certain aspects of the present disclosure relate to sealing configurations for effectively sealing triple points of an enclosure. One aspect of the present disclosure relates to an elastomeric cable seal having a main body and sealing tabs adapted for enhancing effective sealing at triple points formed at an interface between the main body and a housing of the enclosure. In certain examples, the tabs can be tapered along their lengths so as to narrow as the tabs extend away from the main body of the cable seal. In certain examples, the tabs are at a top end of the cable seal. Another aspect of the present disclosure relates to an elastomeric sealing member having a chamfered peripheral surface that provides an enhanced sealing at a triple point between the sealing member and a housing of the enclosure.

Further aspects of the present disclosure relate to sealing configurations for providing effective perimeter sealing between two housing pieces of an enclosure. In this regard, it is desirable to provide effective perimeter sealing without requiring excessive clamping pressures between the housing pieces and without requiring an excessive number of clamps or other fasteners provided about the perimeter of the enclosure. Certain aspects of the present disclosure relate to a perimeter sealing gasket having a transverse cross-sectional profile including an elongated web that is compressed along its length and that includes radial sealing ribs that project laterally outwardly from opposite sides of the web. In certain examples, ribs of the web can include enlarged, rounded heads. In certain examples, the transverse cross-sectional profile includes open space or voids on both sides of the web that assist in allowing the sealing gasket to be compressed at lower compression forces. In certain examples, the transverse cross-sectional profile is compressed at least 1 millimeter or at least 1.5 millimeters along the length of the web. In certain examples, the transverse cross-sectional profile is compressed at least 15, 20 or 25 percent along the length of the web from a non-compressed state to a compressed state when the housing pieces are latched together. In certain examples, the transverse cross-sectional profile is compressed at least 15-25 percent along the length of the web from a non-compressed state to a compressed state when the housing pieces are latched together. In certain examples, the gasket can have a Shore A hardness in the range of 20-60.

Other considerations that relate to the design of enclosures for fiber optic distribution networks include ease of use, reduction in cost, and a reduction in the total number of parts. In this regard, aspects of the present disclosure relate to port size reducers having an integrated configuration in which multiple functions can be provided by one port size reducer. For example, port size reducers in accordance with the principles of the present disclosure can provide port size reducing functions, cable sealing functions and cable clamping functions. Other aspects of the present disclosure relate to blind plugs that are multi-functional. For example, certain blind plugs in accordance with the principles of the present disclosure can provide port closing functionality and can also interface with a cable anchoring station for assisting in anchoring fiber optic cables to an enclosure.

A variety of additional inventive aspects will be set forth in the description that follows. Inventive aspects can relate to individual features and to combinations of features. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the examples disclosed herein are based.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating an enclosure in accordance with the principles of the present disclosure adapted for use in a fiber optic distribution network;

FIG. 2 illustrates a base of the enclosure of FIG. 1 with a cover of the enclosure removed;

FIG. 3 illustrates the base of FIG. 2 with a perimeter gasket of the enclosure exploded from the base;

FIG. 3A is an enlarged, detailed view of a portion of FIG. 3;

FIG. 4 shows the base of FIG. 2 with port size reducers and blind plugs exploded outwardly from a cable seal mounted within a cable seal opening of the base;

FIG. 4A is an enlarged, detailed view of a portion of FIG. 4;

FIG. 5 is a perspective view of a port size reducer in accordance with the principles of the present disclosure;

FIG. 6 is another perspective view of the port size reducer of FIG. 5;

FIG. 7 is a top view of the port size reducer of FIG. 5;

FIG. 8 is a bottom view of the port size reducer of FIG. 5;

FIG. 9 is a first side view of the port size reducer of FIG. 5;

FIG. 10 is a second, opposite side view of the port size reducer of FIG. 5;

FIG. 11 is an outer end view of the port size reducer of FIG. 5;

FIG. 12 is an inner end view of the port size reducer of FIG. 5;

FIG. 13 is a perspective view of another port size reducer in accordance with the principles of the present disclosure;

FIG. 14 is another perspective view of the port size reducer of FIG. 13;

FIG. 15 is a top view of the port size reducer of FIG. 13;

FIG. 16 is a bottom view of the port size reducer of FIG. 13;

FIG. 17 is a first side view of the port size reducer of FIG. 13;

FIG. 18 is a second, opposite side view of the port size reducer of FIG. 13;

FIG. 19 is an outer, end view of the port size reducer of FIG. 13;

FIG. 20 is an inner end view of the port size reducer of FIG. 13;

FIG. 21 is a perspective view of a blind plug in accordance with the principles of the present disclosure;

FIG. 22 is another perspective view of the blind plug of FIG. 21;

FIG. 23 is a top view of the blind plug of FIG. 21;

FIG. 24 is a bottom view of the blind plug of FIG. 21;

FIG. 25 is a first side view of the blind plug of FIG. 21;

FIG. 26 is a second, opposite side view of the blind plug of FIG. 21;

FIG. 27 is an outer end view of the blind plug of FIG. 21;

FIG. 28 is an inner end view of the blind plug of FIG. 21;

FIG. 29 is a perspective view of another blind plug in accordance with the principles of the present disclosure;

FIG. 30 is another perspective view of the blind plug of FIG. 29;

FIG. 31 is a top view of the blind plug of FIG. 29;

FIG. 32 is a bottom view of the blind plug of FIG. 29;

FIG. 33 is a first, side view of the blind plug of FIG. 29;

FIG. 34 is a second, opposite side view of the blind plug of FIG. 29;

FIG. 35 is an outer, end view of the blind plug of FIG. 29;

FIG. 36 is an inner, end view of the blind plug of FIG. 29;

FIG. 37 is a cross-sectional view of the enclosure of FIG. 1 taken along section line 37-37 of FIG. 1;

FIG. 37A is an enlarged, detailed view of a portion of FIG. 37;

FIG. 38 is a cross-sectional view through the base of FIG. 2 taken along section line 38-38 of FIG. 2;

FIG. 39 is a perspective, cross-sectional view taken through the enclosure of FIG. 1;

FIG. 40 is a transverse cross-sectional view of a perimeter seal of the enclosure of FIG. 1 taken along section line 40-40 of FIG. 3;

FIG. 41 is a perspective view of a cable seal in accordance with the principles of the present disclosure;

FIG. 42 is another perspective view of the cable seal of FIG. 41;

FIG. 43A shows the cable seal of FIGS. 41 and 42 in a non-compressed configuration positioned within a cable seal opening of the base of FIG. 2;

FIG. 43B shows the cable seal of FIGS. 41 and 42 in a compressed orientation between the base and the cover of the enclosure of FIG. 1;

FIG. 44 is a top view showing the cable seal of FIGS. 41 and 42 in the cable seal opening with no gasket in place over the cable seal;

FIG. 45 is a top view showing the cable seal of FIGS. 41 and 42 mounted within the cable seal opening with the perimeter gasket shown extending across a top peripheral surface of the cable sealing member;

FIG. 46 is a top view showing the cable seal opening of the base of FIG. 2 with no cable seal mounted therein;

FIG. 47 is a perspective view of another cable seal in accordance with the principles of the present disclosure;

FIG. 48 is another perspective view of the cable seal of FIG. 47;

FIG. 49A shows the cable seal of FIGS. 47 and 48 mounted within the cable seal opening of the base of FIG. 2, the cable seal is shown in a non-compressed orientation;

FIG. 49B shows the cable seal of FIGS. 47 and 48 in a compressed orientation within the cable seal opening of the base of FIG. 2;

FIG. 50 is a top view showing the cable seal of FIGS. 47 and 48 mounted within the cable seal opening of the base of FIG. 2 without a gasket extending across the top of the cable seal; and

FIG. 51 is a top view showing the cable seal of FIGS. 47 and 48 mounted within the cable seal opening of the base of FIG. 2 with the perimeter gasket shown extending across the top of the cable seal.

DETAILED DESCRIPTION

Aspects of the present disclosure relate to enclosures having perimeter sealing that provides effective sealing at relatively low compression levels. Another aspect of the present disclosure relates to cable seal configurations that provide enhanced sealing at triple point locations defined between housing pieces of the enclosure. Still another aspect of the present disclosure relates to elongated, multi-function port size reducers and blind plugs adapted to reduce the part count and complexity of the enclosure.

FIG. 1 illustrates an enclosure 20 in accordance with the principles of the present disclosure suitable for use in a fiber optic distribution network. The enclosure 20 includes a housing 22 having a first housing piece 24 (e.g., a base) and a second housing piece 26 (e.g., a cover). The first and second housing pieces 24, 26 are configured to be coupled together to define a housing interior 28 (see FIG. 2). The first and second housing pieces 24, 26 interface with one another (e.g., mate together, engage one another, etc.) at an interface location 30 that extends about a perimeter P of the housing 22. A gasket 32 provides a perimeter seal between the first housing piece 24 and the second housing piece 26. The gasket 32 is positioned between the first and second housing pieces 24, 26 at the interface location 30. The first housing piece 24 defines a plurality of cable seal openings 34 in which cable seals 36 are mounted. Cable anchoring stations 38 (i.e., locations) are positioned within the housing interior 28 for anchoring cables routed through the cable seals 36 relative to the housing 22. The cable anchoring stations 38 include cable clamping locations 40 positioned in alignment with the cable seal openings 34. Port size reducer plugs 42 a, 42 b are shown mounted within major cable ports 44 defined by the cable seals 36. The port size reducer plugs 42 a, 42 b respectively define minor cable ports 46 a, 46 b. Blind plugs 48 a, 48 b are respectively mounted within the minor cable ports 46 a, 46 b. The port size reducer plugs 42 a, 42 b and the blind plugs 48 a, 48 b are constructed to perform multiple functions and include portions that interact with the cable seals 36 and portions that interact with the cable anchoring stations 38. In certain examples, the port size reducer plugs 42 a, 42 b are elongated and each has a molded, monolithic, one-piece construction. Similarly, the blind plugs 48 a, 48 b are also elongated and can each have a molded, monolithic, one-piece construction.

Referring to FIGS. 1 and 2, the first and second housing pieces 24, 26 can be pivotally connected at a hinge 50 that extends along a major side of the housing 22. Clamping latches 52 can be used to secure (e.g., clamp, fix or otherwise retain) the first and second housing pieces 24, 26 together. In certain examples, single clamping latches 52 are provided at minor sides of the housing 22 and a plurality of clamping latches 52 are provided at a major side of the housing 22 that is opposite from the hinge 50.

As shown at FIG. 2, a stack of pivotal fiber management trays 54 is shown mounted within the first housing piece 24. The fiber management trays 54 can include fiber routing paths for routing excess optical fiber in looped configurations that prevent the optical fiber from being bent beyond minimum bend radius requirements. The fiber management trays 54 can also function as splice holders for holding a plurality of splices. Additionally, the fiber management trays 54 can retain and protect fiber optic components such as passive optical splitters and/or wavelength division multiplexers.

As shown at FIGS. 1 and 37, a plurality of ruggedized fiber optic adapters 56 are shown mounted to the second housing piece 26. The ruggedized fiber optic adapters 56 include exterior ports 58 and interior ports 60. The exterior ports 58 are adapted to receive ruggedized fiber optic connectors corresponding to pre-connectorized drop cables. As depicted, the exterior ports 58 are enclosed by dust plugs 62 and are environmentally sealed. By removing the dust plugs 62, the ruggedized fiber optic connectors corresponding to the pre-connectorized drop cables can be inserted into the exterior ports 58. Preferably, a sealed relationship exists between the ruggedized fiber optic connectors and the exterior ports 58 of their corresponding ruggedized fiber optic adapters 56. Additionally, a robust coupling technique (e.g., a threaded coupling, a bayonet style coupling or other like type of coupling) can be used to secure the ruggedized fiber optic connectors to the ruggedized fiber optic adapters 56. The interior ports 60 of the ruggedized fiber optic adapters 56 receive connectorized ends 64 of connectorized pigtails 66. When the ruggedized fiber optic connectors are inserted within the exterior ports 58 of the ruggedized fiber optic adapters 56, the ruggedized fiber optic connectors are optically coupled to the connectorized ends 64 of the corresponding connectorized pigtails 66. It will be appreciated that a sealed relationship exists between the ruggedized fiber optic adapters 56 and the housing 22. Similarly, a sealed interface exists between the ruggedized fiber optic connectors and the ruggedized fiber optic adapters 56.

In use of the enclosure 20, a multi-fiber distribution cable such as a trunk cable can be passed through the interior of the enclosure by routing the trunk cable through the major cable ports 44 defined by the cable seals 36. The portion of the distribution cable within the housing interior 28 can be subjected to a window-cutting operation in which the outer jacket is removed to provide access to the optical fibers of the distribution cable. Selected ones of the optical fibers can be accessed, cut and optically coupled to smaller cables (e.g., drop cables) routed from the enclosure 20 through the port size reducers. For example, the accessed fibers can be routed to the fiber management trays 54 and spliced to optical fibers corresponding to drop cables routed out of the enclosure 20 through the minor cable ports 46 a, 46 b defined by the port size reducer plugs 42 a, 42 b. Alternatively, the accessed optical fibers can be routed to the fiber management trays 54 and spliced to the connectorized pigtails 66 having the connectorized ends 64 inserted within the interior ports 60 of the ruggedized fiber optic adapters 56. In still other examples, the optical fibers accessed from the pass-through cable can be routed to the fiber management trays 54 and optically coupled to fiber optic components supported on the fiber management trays 54 such as passive optical splitters or wavelength division multiplexers. The optical outputs of such fiber optic components can be optically coupled to the connectorized pigtails 66 having connectorized ends 64 inserted within the interior ports 60 of the ruggedized fiber optic adapters 56 or can be optically coupled to optical fibers corresponding to cables routed out of the enclosure 20 through the minor cable ports 46 a, 46 b.

Referring to FIGS. 2 and 37-39, the cable anchoring stations 38 can include a plurality of clamping elements 68 that can cooperate to define the cable clamping locations 40. In certain examples, the clamping elements 68 can be stacked on top of one another and fastened together using fastening elements. In certain examples, the fastening elements can include fasteners such as bolts 70. As shown at FIG. 38, the clamping elements 68 can include lower clamping elements 68 a that are integrated with the first housing piece 24. The clamping elements 68 can also include intermediate clamping elements 68 b fastened to the lower clamping elements 68 a, and upper clamping elements 68 c fastened to the intermediate clamping elements 68 b. The cable clamping locations 40 can be provided at clamping pockets or receptacles 72 defined between the clamping elements 68. In certain examples, the clamping pockets 72 can be relatively large in size and can be configured for receiving relatively large cables such as the trunk cables that are passed through the enclosure 20. It will be appreciated that the clamping pockets 72 are generally co-axially aligned with the major cable ports 44 defined by the cable seals 36.

It will be appreciated that the cable seals 36, the gasket 32 and the port reducing plugs 42 a, 42 b can all have resilient, elastomeric constructions. In certain examples, the various sealing components can have a polymeric construction, a rubber construction or a rubber-like construction. In certain examples, the sealing elements can be compressible and can be configured to elastically deform to fill voids for sealing purposes.

As previously indicated, the cable seals 36 mount at the cable seal openings 34 of the first housing piece 24. It will be appreciated that the cable seal openings 34 can be configured to effectively retain the cable seals 36. For example, the cable seal openings 34 can define seal retention pockets 74 defined by inner and outer flanges 76, 78. The inner and outer flanges 76, 78 overlap the cable seals 36 such that the cable seals 36 are effectively retained within the cable seal openings 34. The cable seals 36 can include slit or tear locations 79 so as to function as wrap-around seals for allowing cables to be laterally inserted into the major cable ports 44.

It will be appreciated that the major cable ports 44 defined by the cable seals 36 are configured to receive round, relatively large fiber optic cables. Examples of this type of cable include multi-fiber distribution cables of the type typically passed through the enclosure 20. The port size reducer plugs 42 a, 42 b can function as port size converters for allowing the cable seals 36 to accommodate smaller cables. For example, when the port size reducer plugs 42 a, 42 b are inserted within the major cable ports 44 of the cable seals 36, a sealed relationship exists between the exterior of the port size reducer plugs 42 a, 42 b and the cable seals 36. The minor cable ports 46 a, 46 b are configured for receiving and sealing smaller cables such as drop cables. The minor cable ports 46 a are adapted for receiving round cables while the minor cable ports 46 b are adapted for receiving flat cables. The blind plugs 48 a, 48 b are configured to plug and seal the minor cable ports 46 a, 46 b when the minor cable ports 46 a, 46 b are not occupied by cables. When it is desired to route a cable through one of the minor cable ports 46 a, 46 b, the corresponding blind plug 48 a, 48 b is removed thereby allowing for the insertion of the corresponding cable through the corresponding minor cable port 46 a, 46 b.

Referring to FIG. 4A, each of the port size reducer plugs 42 a, 42 b has a one-piece construction with different sections (e.g., portions, regions, extents) configured to perform different functions with respect to the enclosure 20. The different functions can include port size reducing functions, cable sealing functions and cable anchoring functions. In certain examples, the minor cable ports 46 a, 46 b can extend through lengths of the port size reducer plugs 42 a, 42 b. The port size reducer plugs 42 a, 42 b can include first portions 80 a, 80 b and second portions 82 a, 82 b positioned along the lengths of the port size reducer plugs 42 a, 42 b. The port size reducer plugs 42 a, 42 b are sized in shape such that the first portions 80 a, 80 b are configured to fit in a sealed relationship within the major cable ports 44. The second portions 82 a, 82 b of the port size reducer plugs 42 a, 42 b are configured to fit within the clamping pockets 72 defined at the clamping locations 40 of the cable anchoring stations 38.

The first portions 80 a, 80 b of the port size reducer plugs 42 a, 42 b function as port size converters for converting the cable seals 36 to accommodate smaller cables. The first portions 80 a, 80 b can fill the major cable ports 44 of the cable seals 36 and can include exterior surfaces that make sealed contact with the interior of the cable seals 36. The minor cable ports 46 a, 46 b can have transverse cross-sectional shapes that are fully enclosed at the first portions 80 a, 80 b so as to provide uninterrupted sealing about the exterior surface of a cable (e.g., a drop cable) routed therethrough. In certain examples, the first portions 80 a, 80 b of the port size reducer plugs 42 a, 42 b can have truncated conical shapes having major ends 84 and minor ends 86. The truncated conical shapes of the first portions 80 a, 80 b can match corresponding truncated conical shapes of the major cable ports 44. The port size reducer plugs 42 a, 42 b can include first and second retention shoulders 88, 90 positioned adjacent to the major and minor ends 84, 86 of the truncated conical shapes of the first portions 80 a, 80 b. The first and second retention shoulders 88, 90 can engage inner and outer faces of the cable seals 36 to provide for axial retention of the port size reducer plugs 42 a, 42 b within the cable seals 36.

The second portions 82 a, 82 b of the port size reducer plugs 42 a, 42 b are adapted to assist in providing an effective clamping function at the cable anchoring stations 38 for smaller cables. For example, the second portions 82 a, 82 b are configured to fit within the clamping pockets 72 and to assist in clamping drop cables routed through the minor cable ports 46 a, 46 b within the clamping pockets 72. Absent the presence of the second portions 82 a, 82 b, the clamping pockets 72 would be too large to provide effective clamping of the relatively small cables routed through the minor cable ports 46 a, 46 b. Thus, the second portions 82 a, 82 b are configured to fill excess void space within the clamping pockets 72 so that the relatively small cables routed through the minor cable ports 46 a, 46 b can be effectively clamped at the cable anchoring stations 38. In certain examples, the second portions 82 a, 82 b of the port size reducer plugs 42 a, 42 b can be generally cylindrical in shape and can be unitarily formed with the first portions 80 a, 80 b adjacent the minor ends 86 of the truncated conical shapes defined by the first portions 80 a, 80 b. The second portions 82 a, 82 b are configured to generally fill the clamping pockets 72 and are depicted having open sides 92. The open sides 92 allow the clamping elements 68 to directly contact cables routed through the port size reducer plugs 42 a, 42 b so as to provide direct clamping force upon the jackets of the cables routed through the port size reducer plugs 42 a, 42 b.

Referring again to FIG. 4A, the blind plugs 48 a, 48 b are configured to fit within the minor cable ports 46 a, 46 b. The blind plugs 48 a, 48 b are configured to effectively seal the minor cable ports 46 a, 46 b when the cable ports 46 a, 46 b are not occupied by cables. The blind plugs 48 a, 48 b are also configured to assist in providing effective clamping at the cable anchoring stations 38. The blind plugs 48 a have elongated transverse cross-sectional shapes that correspond to the shapes of the minor cable ports 46 a, and the blind plugs 48 b have round transverse cross-sectional shapes that correspond to the shapes of the minor cable ports 46 b.

Each of the blind plugs 48 a, 48 b has an elongated construction having an outer end with a handle 100 a, 100 b. Each of the blind plugs 48 a, 48 b also includes a first extent 102 a, 102 b that coincides with the first portion 80 a, 80 b of the port reducing plug 42 a, 42 b, and a second extent 104 a, 104 b that coincides with the second portion 82 a, 82 b of the port size reducer plug 42 a, 42 b. The first extents 102 a, 102 b fill the minor cable ports 46 a, 46 b at the first portions 80 a, 80 b so as to effectively seal and close the minor cable ports 46 a, 46 b when the minor cable ports 46 a, 46 b are not in use. The second extents 104 a, 104 b effectively fill the minor cable ports 46 a, 46 b at the second portions 82 a, 82 b of the port reducing plugs 42 a, 42 b so as to limit void space within the second portions 82 a, 82 b so that the second portions 82 a, 82 b do not excessively deform during clamping. For example, if one of the minor cable ports 46 a, 46 b of a given port size reducer plug 42 a, 42 b were occupied with a cable while the other minor cable port 46 a, 46 b of the port size reducer plug 42 a, 42 b were to be unoccupied at the second portion 82 a, 82 b, the unoccupied minor cable port 46 a, 46 b would allow the second portion 82 a, 82 b to deform a substantial amount during clamping thereby preventing sufficient clamping force from being applied to the cable routed through the other minor cable port 46 a, 46 b.

The blind plugs 48 a, 48 b can also include first retention shoulders 106 a, 106 b positioned adjacent the handles 100 a, 100 b and second retention shoulders 108 a, 108 b positioned between the first extents 102 a, 102 b and the second extents 104 a, 104 b. The first retention shoulders 106 a, 106 b and the second retention shoulders 108 a, 108 b provide for effective axial retention of the blind plugs 48 a, 48 b within their corresponding minor cable ports 46 a, 46 b.

The gasket 32 of the enclosure 20 is adapted to provide a perimeter seal at the interface between the first and second housing pieces 24, 26. In certain examples, the first and second housing pieces can have a mating relationship at the interface location 30. For example, as shown at FIG. 39, the second housing piece 26 can include channels 110 at the ends of the housing that receive rails 111 of the first housing piece 24 such that the second housing piece 26 nests over the first housing piece 24 to provide effective mating and alignment between the first and second housing pieces 24, 26. The second housing piece 26 can also include a lip that overhangs the first housing piece 24 along the major sides of the enclosure 20. The interface location 30 also includes gasket engagement and compression surfaces for causing compression of the gasket 32 when the first and second housing pieces 24, 26 are mated and clamped together. As shown at FIGS. 37 and 37A, the second housing piece 26 defines a channel 112 in which the gasket 32 is received. The channel 112 includes a gasket engagement surface 114 that opposes a corresponding gasket engagement surface 116 of the first housing piece 24. When the first and second housing pieces 24, 26 are clamped together, the gasket 32 is compressed between the gasket engagement surfaces 114, 116. Prior to compression, the gasket 32 has a height H that is larger than the depth of the channel 112.

Referring to FIG. 40, the gasket 32 has a transverse cross-sectional shape including a web 120 having a length L that extends between first and second ends 122, 124 of the web 120. The web 120 includes first and second sides 126, 128 that extend along the length L between the first and second ends 122, 124. The transverse cross-sectional shape has enlarged heads 130 at the first and second ends 122, 124. The transverse cross-sectional shape also has first ribs 132 that project outwardly from the first side 126 of the web 120 at a location between the enlarged heads 130, and second ribs 134 that project outwardly from the second side 128 of the web 120 at a location between the enlarged heads 130. The first and second ribs 132, 134 are arranged generally perpendicular with respect to the web 120. When the gasket 32 is compressed between the gasket engagement surfaces 114, 116 of the first and second housing pieces 24, 26, the gasket 32 is compressed in an orientation parallel to the length L of the web 120 such that the web 120 is axially compressed along its length. In this way, the gasket 32 is compressed in an orientation that is perpendicular relative to the first and second ribs 132, 134 and parallel to the web 120. Thus, during compression, the enlarged heads 130 are compressed toward one another. In one example, the transverse cross-sectional shape of the gasket is symmetric about an axis 136 that is parallel to the length L of the web 120 and that bisects the web 120. The configuration of the transverse cross-sectional shape of the gasket 32 assists in providing effective perimeter sealing of the housing 22 without requiring excessive clamping forces. In other examples, the transverse cross-sectional profile of the gasket can have a single first rib that projects from the first side of the web and a single second rib which projects from the opposite second side of the web. In other examples, other gasket profiles can be used.

In certain examples, the transverse cross-sectional profile of the gasket 32 is compressed at least 1 millimeter or at least 1.5 millimeters along the length of the web. In certain examples, the transverse cross-sectional profile of the gasket 32 is compressed at least 15, 20 or 25 percent along the length of the web from a non-compressed state to a compressed state when the housing pieces are latched together. In certain examples, the transverse cross-sectional profile of the gasket 32 is compressed at least 15-25 percent along the length of the web from a non-compressed state to a compressed state when the housing pieces are latched together. In certain examples, the gasket can have a Shore A hardness in the range of 20-60. In certain examples, the gasket can have a profile height in the range of 5-10 millimeters or in the range of 6-9 millimeters.

Referring to FIGS. 41 and 42, the cable seals 36 each include a main body 140 that defines the major cable ports 44. The main body 140 includes a generally flat top peripheral surface 142, generally flat side peripheral side surfaces 144, and a rounded bottom peripheral surface 146. The cable seal 36 also includes structure for providing enhanced triple point sealing. For example, the cable seal 36 includes sealing tabs 148 that project outwardly from the side peripheral surfaces 144 of the main body 140 adjacent the peripheral surface 142 of the main body 140. In certain examples, the tabs can be tapered along their lengths so as to narrow as the tabs extend away from the main body of the cable seal. In certain examples, the tabs are at a top end of the cable seal.

FIGS. 43A and 43B show one of the cable seals 36 mounted within one of the cable seal openings 34. As shown at FIGS. 44-46, the gasket engagement surface 116 of the first housing piece 24 has gap-defining edges 150 that define a gap G in the engagement surface 116 at the cable seal opening 34. As shown at FIGS. 43A, 43B, 44 and 45, the top peripheral surface 142 of the cable seal 36 is configured to bridge the gap G between the gap defining edges 150 of the gasket engagement surface 116. As shown at FIG. 45, the gasket 32 extends across the top peripheral surface 142 of the cable seal 36 and across the gap-defining edges 150 of the gasket engagement surface 116. The sealing tabs 148 of the cable seal 36 extend from the main body 140 of the cable seal 36 across the gap-defining edges 150 and are positioned between the gasket 32 and the gasket engagement surface 116 so as to provide enhanced sealing at the triple point location associated with the gap-defining edges 150.

FIGS. 47 and 48 show another cable seal 36′ that can be mounted at the cable seal openings 34 of the enclosure 20. The cable seal 36′ has an alternative configuration for providing enhanced sealing at triple point locations. The cable seal 36′ has a main body 240 including a top peripheral surface 242, side peripheral surfaces 244 and a rounded bottom peripheral surface 246. The main body 240 defines major cable ports 44. When the cable seal 36′ is mounted within the cable seal opening 34, the top peripheral surface 242 is positioned at the interface location 30 between the first and second housing pieces 24, 26. The top peripheral surface 242 of the cable seal 36′ bridges the gap G between the gap-defining edges 150 of the gasket engagement surface 116 of the first housing piece 24. The gasket 32 extends across the top peripheral surface 242 and across the gap-defining edges 150 of the gasket engagement surface 116. The top peripheral surface 242 of the cable seal 36′ includes an intermediate portion 260 that is raised relative to the gasket engagement surface 116 prior to compression of the cable seal 36′ between the first and second housing pieces 24, 26. The top peripheral surface 242 of the cable seal 36′ also includes outer chamfer portions 262 on opposite sides of the intermediate portion 260 that ramp downwardly from the intermediate portion 260 toward the gap-defining edges 150 of the gasket engagement surface 116 of the first housing piece 24. In this way, the chamfer portions 262 provide a smooth transition between the seal and the gasket engagement surface 116 to avoid an open space at the triple point. FIGS. 49A, 49B, 50 and 51 show the cable seal 36′ mounted within the cable seal opening 34.

The various examples described above are provided by way of illustration only and are not to be construed to limit the scope of the present disclosure. Those skilled in the art will readily recognize various modifications and changes that may be made without departing from the true spirit and scope of the present disclosure. From the foregoing detailed description, it will be evident that modifications and variations can be made without departing from the spirit and scope of the disclosure.

LIST OF REFERENCE NUMERALS AND CORRESPONDING FEATURES

-   20 enclosure -   22 housing -   24 first housing piece -   26 second housing piece -   30 interface location -   32 gasket -   34 cable seal opening -   36 cable seal -   36′ cable seal -   38 cable anchoring station -   40 cable clamping location -   42 a port size reducer plug -   42 b port size reducer plug -   44 major cable ports -   46 a minor cable ports -   46 b minor cable ports -   48 a blind plug -   48 b blind plug -   50 hinge -   52 clamping latches -   54 fiber management trays -   56 ruggedized fiber optic adapters -   58 exterior ports -   60 interior ports -   62 dust plugs -   64 connectorized ends -   66 connectorized pigtails -   68 clamping elements -   68 a lower clamping elements -   68 b intermediate clamping elements -   68 c upper clamping elements -   70 bolts -   72 clamping pockets -   74 seal retention pockets -   76 inner flanges -   78 outer flanges -   79 tear locations -   80 a first portion -   80 b first portion -   82 a second portion -   82 b second portion -   84 major end -   86 minor end -   88 first retention shoulder -   90 second retention shoulder -   92 open side -   100 a handle -   100 b handle -   102 a first extent -   102 b first extent -   104 a second extent -   104 b second extent -   106 a first retention shoulder -   106 b first retention shoulder -   108 a second retention shoulder -   108 b second retention shoulder -   110 channel -   111 rail -   112 channel -   114 gasket engagement surface -   116 engagement surface -   120 web -   122 first end -   124 second end -   126 first side -   128 second side -   130 enlarged heads -   132 first rib -   134 second rib -   136 axis -   140 main body -   142 top peripheral surface -   144 side peripheral surfaces -   146 rounded bottom peripheral surface -   148 sealing tabs -   150 gap-defining edges -   240 main body -   242 top peripheral surface -   244 side peripheral surfaces -   246 rounded bottom peripheral surface -   260 intermediate portion -   262 outer chamfer portions 

What is claimed is:
 1. An enclosure for use in a fiber optic distribution network, the enclosure comprising: a housing including first and second housing pieces configured to be coupled together to define a housing interior, the first and second housing pieces interfacing at an interface location that extends about a perimeter of the housing; a gasket for providing a perimeter seal between the first housing piece and the second housing piece, the gasket being positioned between the first and second housing pieces at the interface location; the gasket having a transverse cross-sectional shape including a web having a length that extends between first and second ends, the web including first and second sides that extend along the length between the first and second ends, the transverse cross-sectional shape having enlarged heads at the first and second ends, the enlarged heads each have a dome shape that projects outwardly from the first and second sides of the web, the transverse cross-sectional shape having at least one first rib that projects outwardly from the first side of the web at a location between the enlarged heads and at least one second rib that projects outwardly from the second side of the web at a location between the enlarged heads, and the gasket being compressed between the first and second housing pieces in a compression orientation parallel to the length of the web such that the web is axially compressed along its length.
 2. The enclosure of claim 1, wherein the first and second ribs are perpendicular to the compression orientation.
 3. The enclosure of claim 1, wherein the transverse cross-sectional shape of the gasket is symmetrical about an axis that is parallel to the length of the web and that bisects the web.
 4. The enclosure of claim 1, wherein the first rib is one of a plurality of first ribs that project outwardly from the first side of the web, and wherein the second rib is one of a plurality of second ribs that project outwardly from the second side of the web.
 5. The enclosure of claim 4, wherein the first ribs are spaced apart along the length of the web and are parallel to one another, and wherein the second ribs are spaced apart along the length of the web and are parallel to one another.
 6. The enclosure of claim 1, wherein a transverse width of the gasket is decreased between the enlarged heads and the first and second ribs.
 7. The enclosure of claim 1, wherein the web defines a series of symmetrical gaps between the enlarged heads and the first and second ribs.
 8. The enclosure of claim 1, wherein the enlarged heads each define a rounded surface at a distal end and a planar surface at a proximal end.
 9. The enclosure of claim 8, wherein the planar surfaces of the enlarged heads are orthogonal to the first and second sides of the web.
 10. The enclosure of claim 8, wherein the planar surfaces of the enlarged heads are parallel to the first and second ribs.
 11. The enclosure of claim 1, wherein the web includes a pair of first ribs that project outwardly from the first side of the web and a pair of second ribs that project outwardly from the second side of the web, and wherein the pair of first ribs and the pair of second ribs are parallel to proximal ends of the enlarged heads.
 12. The enclosure of claim 1, wherein the first and second housing pieces respectively define opposing first and second gasket engagement surfaces at the interface location, wherein the first gasket engagement surface includes gap-defining edges that define a gap in the first gasket engagement surface at a cable seal opening; and wherein the gasket extends across a peripheral surface of a cable seal in the cable seal opening and across the gap-defining edges of the first gasket engagement surface and is compressed between the opposing first and second gasket engagement surfaces. 